Risk factors for IAH/ACS among children dependent on the age group. Respondents were asked to mention disease patterns which, to their experiences, most often cause IAH/ACS in children of different age classes (n = 32 to 63; percentage of given answers). 'Abdominal wall defects' consist of gastroschisis, omphalocele, and diaphragmatic hernia. 'Organ dysfunction' subsumes cardiac insufficiency as well as hepatic and renal dysfunction or failure. 'Postoperative' includes abdominal, cardiac, and thoracic surgery. CLS, capillary leak syndrome; CPAP, continuous positive airway pressure; SIRS, systemic inflammatory response syndrome. aThe different disease patterns which are summarized with 'acute abdomen' are more detailed in Figure 2.